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// license agreements. See the NOTICE file distributed with
// this work for additional information regarding copyright
// ownership. Elasticsearch B.V. licenses this file to you under
// the Apache License, Version 2.0 (the "License"); you may
// not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied.  See the License for the
// specific language governing permissions and limitations
// under the License.

#import <Foundation/Foundation.h>

// executes the given `path` executable, passing `args` array.
// Callback is called for every line in the program's output.
// Returns the program exit status.
int executeAndGetOutput(NSString *path, NSArray *args, BOOL (^callback)(NSString*));

// Returns the current time in microseconds
uint64_t getTimeMicroseconds(void);

// Returns the given string, or @"nil" if its nil.
NSString *strOrNil(NSString *str);
